<template>
    <el-breadcrumb class="app-breadcrumb" separator="/">
        <transition-group name="breadcrumb">
            <el-breadcrumb-item v-for="(item, index) in levelList" :key="item.path">
                <span v-if="item.redirect === 'noRedirect' || index == levelList.length - 1" class="no-redirect">{{ item.meta.title }}</span>
                <a v-else @click.prevent="handleLink(item)">{{ item.meta.title }}</a>
            </el-breadcrumb-item>
        </transition-group>
    </el-breadcrumb>
</template>

<script lang="ts">
export default {
    name: "Breadcrumb",
};
</script>

<script lang="ts" setup>
import { compile } from "path-to-regexp";
import { ref, watch } from "vue";
import { useRoute, useRouter, type RouteLocationMatched } from "vue-router";

const route = useRoute();
const router = useRouter();
const levelList = ref();

const isHome = (route: RouteLocationMatched) => {
    const name = route && route.name;
    if (!name) {
        return false;
    }
    return name.toString().trim().toLocaleLowerCase() === "Home".toLocaleLowerCase();
};

const getBreadcrumb = () => {
    // only show routes with meta.title
    let matched: any[] = route.matched.filter(item => item.meta && item.meta.title);
    const first = matched[0];
    if (!isHome(first)) {
        matched = [{ path: "/home", meta: { title: "首页" } }].concat(matched);
    }

    levelList.value = matched.filter(item => item.meta && item.meta.title && item.meta.breadcrumb !== false);
};

getBreadcrumb();

watch(route, () => {
    getBreadcrumb();
});

const pathCompile = (path: string) => {
    const { params } = route;

    var toPath = compile(path);
    return toPath(params);
};

const handleLink = (item: any) => {
    const { redirect, path } = item;
    if (redirect) {
        router.push(redirect);
        return;
    }
    router.push(pathCompile(path));
};
</script>

<style lang="scss" scoped>
.app-breadcrumb.el-breadcrumb {
    display: inline-block;
    font-size: 14px;
    line-height: 50px;
    margin-left: 8px;

    .no-redirect {
        color: #97a8be;
        cursor: text;
    }
}
</style>
